问题
解答题
先化简:
|
答案
原式=
÷a-1 a a 2-1 a(a+2)
=
×a-1 a a(a+2) (a+1)(a-1)
=
,a+2 a+1
∵a≠0,a+2≠0,a2-1≠0,
∴a的值不能为:0,-2,±1,
∴当a=2时,原式=
=2+2 2+1
.4 3
先化简:
|
原式=
÷a-1 a a 2-1 a(a+2)
=
×a-1 a a(a+2) (a+1)(a-1)
=
,a+2 a+1
∵a≠0,a+2≠0,a2-1≠0,
∴a的值不能为:0,-2,±1,
∴当a=2时,原式=
=2+2 2+1
.4 3